采用宏观形貌检查、维氏硬度测试、金相检验、扫描电镜观察及能谱(EDS)分析,对某厂气化炉煤粉烧嘴(材质Inconel 600)头部开裂原因进行分析。结果表明，煤粉中硫杂质在高温条件下转变成气态硫化物，其引起烧嘴中心孔处的镍基合金优先发生高温硫腐蚀，并形成显微裂纹。在气化炉反复启停过程中，烧嘴中心孔处的显微裂纹在热应力作用下加剧扩展，导致烧嘴头部中心孔处最终出现宏观开裂。

The cracking causes of the burner head made of Inconel600 in a gasifier were analyzed by macroscopic examination, Vickers hardness testing, metallographic examination, scanning electron microscope (SEM) and energy dispersive spectrometer (EDS). The results showed that sulfur as an impurity in the pulverized coal transformed into the gaseous sulfide at high temperature, which induced the nickel-base superalloy of the burner head to suffer sulfur-corrosion preferentially. The microcracks caused by the high-temperature sulfur-corrosion further expanded with the increase of the thermal stress during the gasifier start and stop, and the burner head cracked at last.